<template>
	<view>
		<view class="search-bar">
			<uni-search-bar :radius="100" clearButton="none" @input="input"></uni-search-bar>
		</view>
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length!==0">
			<view class="sugg-item" v-for="(item,index) in searchResults" :key='index'
				@click="gotoDetail(item.goods_id)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<view class="history-title">
				<text>
					搜索历史
				</text>
				<uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
			</view>
			<view class="history-list">
				<uni-tag  type="success" :text="item" v-for="(item, i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>
</template>
cleanHistory()
<script>
	export default {
		data() {
			return {
				timer: null,
				kw: '',
				searchResults: [],
				historyList: []
			};
		},
		computed: {
		  historys() {
		    // 注意：由于数组是引用类型，所以不要直接基于原数组调用 reverse 方法，以免修改原数组中元素的顺序
		    // 而是应该新建一个内存无关的数组，再进行 reverse 反转
		    return [...this.historyList].reverse()
		  }
		},
		onLoad() {
			 this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods: {
			gotoGoodsList(kw){
				uni.navigateTo({
					url:'subpkg/goods-detail/goods-detail?query=' + kw
				})
			},
			cleanHistory(){
				  // 清空 data 中保存的搜索历史
				  this.historyList = []
				  // 清空本地存储中记录的搜索历史
				  uni.setStorageSync('kw','')
			},
			// 2. 保存搜索关键词的方法
			saveSearchHistory(){
				// 1. 将 Array 数组转化为 Set 对象
				const set=new Set(this.historyList)
				// 2. 调用 Set 对象的 delete 方法，移除对应的元素
				  set.delete(this.kw)
				// 3. 调用 Set 对象的 add 方法，向 Set 中添加元素
				  set.add(this.kw)
				// 4. 将 Set 对象转化为 Array 数组
				  this.historyList = Array.from(set)
				// 调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
				  uni.setStorageSync('kw', JSON.stringify(this.historyList))
			},
			gotoDetail(goods_id) {
				uni.navigateTo({
					url: '/subpkg/goods-detail/goods-detail?goods_id=' + goods_id
				})
			},
			input(e) {
				// 清除 timer 对应的延时器
				clearTimeout(this.timer)
				this.timer = setTimeout(() => {
					this.kw = e
					this.getSearchList()
				}, 500)
			},
			  // 根据搜索关键词，搜索商品建议列表
			async getSearchList() {
				if (this.kw === '') {
					this.searchResults = []
					return
				}
				const {
					data: {
						message,
						meta
					}
				} = await uni.$http.get('/api/public/v1/goods/qsearch', {
					query: this.kw
				})
				if (meta.status !== 200) return uni.$showMsg()
				console.log(message)
				this.searchResults = message
				this.saveSearchHistory()
			}
		}
	}
</script>

<style lang="scss">
	.search-bar {
		position: sticky;
		top: 0;
		z-index: 99;
	}

	.sugg-list {
		padding: 0 5PX;

		.sugg-item {
			font-size: 12px;
			padding: 13px 0;
			display: flex;
			justify-content: space-between;
			align-items: center;
			border-bottom: 1px solid #efefef;

			.goods-name {
				overflow: hidden;
				white-space: nowrap;
				text-overflow: ellipsis;
				margin-right: 3px;
			}
		}

	}

	.history-box {
		padding: 0 5PX;

		.history-title {
			font-size: 12px;
			display: flex;
			justify-content: space-between;
			line-height: 40px;
			align-items: center;
			border-bottom: 1px solid #efefef;

		}

		.history-list {
			display: flex;
			flex-wrap: wrap;

			.uni-tag {
				margin:5px 5px 0 0;
				
			}
		}
	}
</style>
